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			<h1>common_schema</h1> <strong>2.2</strong> documentation
			<div class="subtitle">DBA's framework for MySQL</div>
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				<h2><a href="global_status_diff_clean.html">global_status_diff_clean</a></h2>	
<h3>NAME</h3>
global_status_diff_clean: Status variables difference over time, with spaces where zero diff encountered
<h3>TYPE</h3>
View

<h3>DESCRIPTION</h3>
<p></p>

<p><i>global_status_diff_clean</i> is a visual presentation case for <a href="global_status_diff.html">global_status_diff</a>
</p>

<p>It presents with same data from <i>global_status_diff</i>, except that when no difference encountered (value unchanged
for the sampling duration), the zero value is replaced with empty text. 
</p>

<p>
It is merely a visualization aid, allowing the eye to more easily catch changed values. Automated reads should keep to <i>global_status_diff</i>.
</p>

<h3>STRUCTURE</h3>

<blockquote><pre>
mysql&gt; DESC common_schema.global_status_diff_clean;
+------------------------+---------------+------+-----+---------+-------+
| Field                  | Type          | Null | Key | Default | Extra |
+------------------------+---------------+------+-----+---------+-------+
| variable_name          | varchar(64)   | YES  |     | NULL    |       |
| variable_value_0       | longtext      | YES  |     | NULL    |       |
| variable_value_1       | varchar(1024) | YES  |     | NULL    |       |
| variable_value_diff    | varbinary(23) | YES  |     | NULL    |       |
| variable_value_psec    | varbinary(23) | YES  |     | NULL    |       |
| variable_value_pminute | varbinary(23) | YES  |     | NULL    |       |
+------------------------+---------------+------+-----+---------+-------+
</pre></blockquote>

<h3>SYNOPSIS</h3>
<p>The structure of this view is identical to that of <a href="global_status_diff.html">global_status_diff</a>, except:</p>

<ul>
	<li><strong>variable_value_diff</strong>: difference between the two samples, or empty text when difference is zero</li>
	<li><strong>variable_value_psec</strong>: average change in value per second of execution, or empty text when difference is zero</li>
	<li><strong>variable_value_pminute</strong>: estimated (via extrapolation) average change in value per minute of execution, or empty text when difference is zero</li>
</ul>

<h3>EXAMPLES</h3>
<p>Get status difference for various InnoDB write metrics:</p>
<blockquote><pre>mysql&gt; SELECT * FROM common_schema.global_status_diff_clean WHERE variable_name LIKE 'innodb_%write%';
+-----------------------------------+------------------+------------------+---------------------+---------------------+------------------------+
| variable_name                     | variable_value_0 | variable_value_1 | variable_value_diff | variable_value_psec | variable_value_pminute |
+-----------------------------------+------------------+------------------+---------------------+---------------------+------------------------+
| innodb_buffer_pool_write_requests | 1000933916       | 1000934526       | 610                 | 61                  | 3660                   |
| innodb_data_pending_writes        | 0                | 0                |                     |                     |                        |
| innodb_data_writes                | 100388839        | 100389001        | 162                 | 16.2                | 972                    |
| innodb_dblwr_writes               | 603346           | 603346           |                     |                     |                        |
| innodb_log_write_requests         | 338954473        | 338954531        | 58                  | 5.8                 | 348                    |
| innodb_log_writes                 | 69347559         | 69347618         | 59                  | 5.9                 | 354                    |
| innodb_os_log_pending_writes      | 0                | 0                |                     |                     |                        |
+-----------------------------------+------------------+------------------+---------------------+---------------------+------------------------+
</pre></blockquote>

<h3>ENVIRONMENT</h3>
MySQL 5.1 or newer

<h3>SEE ALSO</h3>
<a href="global_status_diff.html">global_status_diff</a>,
<a href="global_status_diff_nonzero.html">global_status_diff_nonzero</a>
<h3>AUTHOR</h3>
Shlomi Noach
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					<h3>ROUTINES</h3>
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						<li><a title="Execution &amp; flow control" href="execution_routines.html">Execution & flow control</a></li>
						<li><a title="General" href="general_routines.html">General</a></li>
						<li><a title="Process" href="process_routines.html">Process</a></li>
						<li><a title="Query analysis" href="query_analysis_routines.html">Query analysis</a></li>
						<li><a title="Schema analysis" href="schema_analysis_routines.html">Schema analysis</a></li>
						<li><a title="Security" href="security_routines.html">Security</a></li>
						<li><a title="Text" href="text_routines.html">Text</a></li>
						<li><a title="Time &amp; date" href="temporal_routines.html">Time & date</a></li>
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					<h3>VIEWS</h3>
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						<li><a title="Schema analysis" href="schema_analysis_views.html">Schema analysis</a></li>
						<li><a title="Data dimension" href="data_dimension_views.html">Data dimension</a></li>
						<li><a title="Process" href="process_views.html">Process</a></li>
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						<li><a title="InnoDB Plugin" href="innodb_plugin_views.html">InnoDB Plugin</a></li>
						<li><a title="Percona server" href="percona_server_views.html">Percona Server</a></li>
						<li><a title="TokuDB" href="tokudb_views.html">TokuDB</a></li>
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					<h3>DATA</h3>
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						<li><a title="tables" href="tables.html">Tables</a></li>
						<li><a title="variables" href="variables.html">Variables</a></li>
					</ul>						
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						<li><a title="Help" href="help.html">help</a></li>
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						<li><a title="status" href="status.html">status</a></li>
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